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Morphological and molecular evidence reject conspecificity of Malagasy and Mascarene Parablechnum (Polypodiopsida, Blechnaceae)

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Morphological and molecular evidence reject conspecificity of Malagasy and Mascarene Parablechnum (Polypodiopsida, Blechnaceae)

by
Molino, Sonia; Lafuente, Irene; Rouhan, Germinal; Medina, Rafael

Publication date
Usage
Attribution 4.0 InternationalCreative Commons Licenseby
Topics
biogeography, Madagascar, Parablechnum humbertii, Parablechnum marginatum, Réunion, sporangiasters
Publisher
Pensoft Publishers
Collection
biodiversity
Contributor
Pensoft Publishers
Language
English
Rights
https://biodiversitylibrary.org/permissions
Rights-holder
Copyright held by individual article author(s).
Volume
214
Item Size
17.5M
Abstract
Under the current treatment of the Blechnaceae, only one species of the fern genus Parablechnum is recognised in the western Indian Ocean, often referred to as P. marginatum. Two varieties are currently recognised within it: a type variety present in the Mascarene Islands of Réunion and Mauritius and P. marginatum var. humbertii in Madagascar. Recent molecular evidence suggested that these two varieties are not closely related, questioning their conspecific status. To collect further evidence to support a taxonomic decision, we performed a morphological study based on 57 herbarium specimens comparing traits from general morphology, cross section of the fertile pinnae, sporangia and spores. As a result, Malagasy specimens can be distinguished morphologically from the Mascarene ones by pinna apex and pinna section, the presence of sporangiasters and spore ornamentation. Additionally, spore size analyses resulted in statistically significant differences between both varieties. Our results, aligned with the available phylogenetic data, support that these two taxa should be recognised as separate species and, hence, we propose the necessary new combination and provide full descriptions.
Addeddate
2025-05-02 20:20:59
Bhl_virtual_titleid
210913
Bhl_virtual_volume
v.214 (2022)
Call number
10_3897_phytokeys_214_95125
Call-number
10_3897_phytokeys_214_95125
Foldoutcount
0
Genre
article
Identifier
morphologicalmo214moli
Identifier-ark
ark:/13960/s2w4n1ff275
Identifier-bib
10_3897_phytokeys_214_95125
Identifier-doi
10.3897/phytokeys.214.95125


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